JEE Main · 2026 · 08 Apr 2026 · Shift 2 · Chemical Bonding and Molecular Structure

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Bromine trifluoride autoionizes to form BrF2+ and BrF4-. The shapes of the cation and anion are respectively ____ and ____.

(A)bent, square planar✓ Correct
(B)linear, square planar
(C)bent, see-saw
(D)linear, tetrahedral

Answer: (A)

Solution

Br F_{2}^{+}

the bromine carries

\frac{1}{2} (7 + 2 - 1) = 4

electron pairs, two bonding and two lone pairs; the

A X_{2} E_{2}

arrangement gives a bent cation. In

Br F_{4}^{-}

the bromine carries

\frac{1}{2} (7 + 4 + 1) = 6

electron pairs, four bonding and two lone pairs; the

A X_{4} E_{2}

arrangement sets the two lone pairs trans and the four fluorines in a plane, giving a square planar anion. The cation is bent and the anion is square planar.

JEE Main · 2026 · 08 Apr 2026 · Shift 2 · Single correct option

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